BRIEF DESCRIPTION OF THE DRAWING
An exemplary embodiment of the invention is depicted in the drawing. Shown are:
FIG. 1 a perspective view of a meeting chair designed as a cantilever chair with a built-in backrest attachment device according to the invention (not visible);
FIG. 2 a perspective view of a meeting chair designed as a four-legged chair with a built-in backrest attachment device according to the invention (not visible);
FIG. 3 a perspective view of the metal bow according to the invention;
FIG. 4 a perspective view of the metal bow interlocked in the backrest frame and
FIG. 5 an exploded view illustrating the assembly steps for the backrest attachment.
Only those elements essential for understanding the invention are shown. Identical elements are provided with identical reference numbers.
WAYS OF IMPLEMENTING THE INVENTION
The invention is explained in further detail below on the basis of an exemplary embodiment and FIGS. 1 through 5.
FIG. 1 and FIG. 2 each show a perspective view of a meeting chair 1 with a built-in backrest attachment device according to the invention—not visible in FIG. 1 and FIG. 2. FIG. 1 depicts a cantilever chair, and FIG. 2 depicts a four-legged chair. The device according to the invention can be used for both chair types.
The chair 1 comprises a seat 2, a backrest 3, a frame 4, two armrests 5, and the backrest attachment device not visible here. The frame 4 is preferably a metal frame, in particular, a tubular frame. The seat 2 is positioned on cross braces 4′ of the frame 4, is preferably affixed thereon by means of screw couplings, and is thus supported by the frame 4. In the case of the cantilever chair (FIG. 1), only one front cross brace 4′ is provided; in the case of the four-legged chair (FIG. 2), one front cross brace 4′ and one rear cross brace 4′ are provided. In this chair design, the seat 2 and the backrest 3 are configured separately and arranged separately from each other, i.e., without an immediately direct connection between them, on chair 1. The backrest 3, which comprises a backrest frame 6 and padding 16, is connected solely by means of the frame 4, namely on both side parts of the backrest frame 6. The backrest frame 6 is manufactured inexpensively out of plastic.
FIG. 3 shows a perspective view of the metal bow 7 according to the invention. This metal bow has two bends and is designed such that a shorter intermediate piece 9 with a 90° bend is connected to a comparatively long flank 8, the shorter intermediate piece 9 in turn having connected to it a shorter end piece 10 with a 90° bend, wherein an intended level formed by the long flank 8 and the intermediate piece 9 and an intended level formed by the intermediate piece 9 and the end piece 10 are perpendicular to each other.
FIG. 4 shows a perspective view of the metal bow 7 interlocked in the backrest frame 6. The metal bow 7 is inserted with its long flank 8 into the backrest frame 6 through an elongated hole 11 introduced into the backrest frame 6 and is guided into an interlocking device 12 arranged on the inside of the backrest frame 6 and interlocked there with a simple rotary motion. In the interlocked state, the flank 8 extends vertically downward and is thus arranged substantially parallel to the side part of the backrest frame 6, whereas the intermediate piece 9 and the end piece 10 of the metal bow 7 are arranged perpendicularly thereto. The end piece 10 points forward in the direction of the seat 2 and is connected to the frame 4 of the chair 1, as can be seen in FIG. 5.
The additional individual steps for assembling the backrest attachment according to the invention are illustrated in the exploded view corresponding to FIG. 5. The end piece 10 of the metal bow 7 is inserted into a sheath 13 arranged on the underside of an armrest 5 and affixed with a screw 14, which is screwed into a receiving device 17 also arranged on the underside of the armrest 5. The back rest 3 is subsequently slid with the backrest attachment device and the arm rest 5 in the direction of the seat 2, the sheath 13 is slid into the frame 4, and the armrest 5 is mounted on the frame 4 of the chair 1. The attachment thereby is achieved preferably with the aid of a screw 15, which is screwed through the frame 4 into the armrest 5.
The armrest 5 attached in this way now advantageously conceals the upper part of the elongated hole 11 introduced into the backrest frame 6, thus imparting a favorable esthetic impression of the chair. The armrest 5 is designed advantageously as a single piece with the sheath 13 and the receiving device 17 for the screw 14 and, for example, is molded by injection as one integral part made of plastic. Thus, the chair can be manufactured particularly inexpensively.
The device according to the invention is easy to manufacture and to operate. It can be installed advantageously from the outside. Moreover, it is inexpensive. Although only a simple attachment of the backrest 3 is performed via the frame 4, a sufficient degree of stability is achieved.
Naturally, the invention is not restricted to the described example embodiment.
REFERENCE LIST
1 chair
2 seat
3 backrest
4 frame
4′ cross brace of the frame
5 armrest
6 backrest frame
7 metal bow
8 long flank of the metal bow
9 intermediate piece of the metal bow
10 end piece of the metal bow
11 elongated hole
12 interlocking mechanism
13 sheath
14 screw
15 screw
16 padding
17 receiving device
Patent Application
20080036267
